Reinforced-concrete column or pole.



H. B. GRA. i REINPORGED CONCRETE COLUMN 0R POLE.

APPLICATION FILED MAY 27, 1911.

1,071 ,045; Patented Aug. 26, 1913 coLUMBlA PLANQGRAPH cn.. WASHINGTON.D. c.

unrTnn sTaTns PATENT ernten.

HENRI EDOUARD G-RA, OF GRENOBLE, FRANCE.

REINFORCED-CONCRETE COLUMN OR POLE.

Application led May 27, 1911.

To all whom t may concern Be it known that I, HENRI EDOUARD GRA, acitizen of the Confederation of Switzerland, residing at Grenoble, inthe Republic of France, have invented certain new and usefulImprovements in Reinforced- Concrete Columns or Poles, of which thefollowing is a specilication.

My invention relates to a reinforced concrete column or pole theframework of which comprises vertical steel bars intimately boundtogether at intervals by straps or bands and ties, and the whole incasedin concrete, giving a structure of great strength and one that ispractically indeformable. The structure also possesses a high degree ofelasticity permitting it to yield under bending strains withoutbreaking.

I have selected for the purpose of illustrating my invention a poleadapted t-o support telegraph or telephone wires, or electric cables,although it is to be understood that the invent-ion is applicable toother uses.

The invention will be understood by reference to the accompanyingdrawings in which- Figure 1 shows a complete pole in elevation; Fig. 2an enlarged vertical section of a portion of the pole on the plane ofthe line 2 2 of Fig. 4; Fig. 3 a vertical section of a portion of thepole on the plane of the line 8 3 of Fig. 4; Fig. 4 a transverse sectionon the plane 0f the line 4-4 of Fig. 2; Fig. 5 a transverse section onthe plane of the line 5-5 of Fig. 2; Fig. 6 a transverse section throughthe upper part of the pole on the plane of the line 6 6 of Fig. l; andFig. 7 a view of a portion of the metal framework around which theconcrete is cast in suitable molds.

Similar reference numerals indicate similar parts in the several views.

The complete structure is of pyramidal form to give increased strength,and the framework around which concrete is cast comprises a series ofvertical stay rods l on two sides of the pole. Various arrangements maybe adopted for the disposition of these stay rods and their number mayvary according to requirements. Thus, some of them may extend the entirelength of the pole, others two-thirds or other distance of the length ofthe pole, and still others one-third the length of the pole; or they maybe so disposed that there may be t-he desired number, say six, at eachside extending from the Specification of Letters Patent.

Patented Aug. 26,1913.

Serial No. 629,806.

base Aone-third of the length of the pole; four for the next third; andtwo, preferably at the corners, for the remaining one-third of the pole.I merely give these numbers as a suggestion which has been followedsuccessfully in practice.

The stay rods are maintained in their relation to each other by bands 2which are dispo-sed at regular intervals apart, the said bands passingaround the stay rods and anchored thereto in any suitable manner, as'bylacing, as indicated in Fig. 7. The ends of the bands may be joined byriveting, as shown in Fig. 4. In addition to the groups of stay rods l,I provide an additional rod 3 in the center of the sides on which arethe rods l. These center rods 3 extend the full length of the pole, andare secured to the bands 2 and are bound together by ties 4 spacedthroughout the pole at desired intervals between the bands 2. The rods,bands and ties constituting the framework are preferably of steel.

About the framework above described is cast, by means of suitable molds,cement of good quality so that the framework will be completely embeddedtherein. The molds are so constructed that the two sides of the polecontaining the sets of stay rods l and 3 will be plain surfacesythroughout the length of the pole, and the two other faces will beformed with recessed sections 5. As shown in Figs. 3 and 4, the concreteabout the bands 2 extends throughout the entire section of the po-le.That is to say, the bands 2 are completely embedded in the concrete, andthe latter is of such thickness above and below the bands as to providesubstantial foot-rests or steps 6 for climbing. These sections, as willbe readily understood, are reinforced throughout by the bands 2. Betweenthe steps 6 a cross section of the pole is in the fo-rm of a double T,the plain surfaced sides ofthe pole constituting the heads 7 connectedby a web 8, the latter being reinforced by the ties 4, which preventoblique fracture when the pole is bent under strain.

By the arrangement of the vertical rods 5 and 6 in the heads 7, and t-hedisposition of the bands 2 and ties 4 the modulus of elasticity of thepole is such as to permit considerable bending in the directionof thearrows in Fig. 1 without fracture. It has been demonstrated in practicethat a pole constructed as described is capable of considerable iiexurewithout showing any substantial deformation or a fracture of theconcrete.

rihe upper part of the pole is preferably east solid; that. is, wit-houtthe recessed seetions 5, as shown in Fig. l.

ll/Tliat l claim and desire to secure by Letters Patent of the UnitedStates is A concrete pole having in cross section alternating double Tsections and square or l" rectangular sections presenting thereby plainsurfaces on two opposite sides of the pole and rentrant sections on thetwo other sides,

longitudinal stay rods on the sides having the plain surfaces, and bandsaround said rods embedded in the square or rectangular sections.

In testimony whereof I have hereunto signed my name in the presence oftwo subseribing witnesses.

HENRI EDOUARD GRA.'

Witnesses T. BARRIER, J AMES GRA.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, 2D. C.

